The IRON FIST XXXTREME Poppers 10ml is based on the original pentyl nitrite and is a very strong popper and made for XXXTREME sessions. Expand your fist experience and enjoy extra big parts with the IRON FIST XXXTREME Poppers. This popper is not for beginners. Observe the safer sex rules when fisting. By the way: Fist Lube is also available for purchase.